System for control of moving bodies by radiant energy



J'. H. HAMMOND, JR. SYSTEM FOR CONTROL OF MOVING BODIES BY RADIANT ENERGY. APPLICATION mm Aue.6. 19ml REN-Ewen MAY 3,1922.

31,418,792@ Patented June 6, 1922.

2 SHEETS-SHEET l.

` J. H. HAMMoNm-JR. SYSTEM FOR CONTROL 0F MOVING BODIES BY RADIANT ENERGY. APPLICATION FILED AUG.S. |914. RENEWED MAY 3, i922- M4189? 92., PatentedJune 6, 1922.

2 SHEETS-SHEET 2.

JOHN' HLAYIS4 HAMMOND, JR., 0F GLOUCESTER, MASSACHUSETTS.

SYSTEM ron' CONTROL or MovNG BODIES BY MDIANT ENERGY.

spcification of etters ratent. Patented June 6, 31.922.

Application mea August s, 1914,seria1 No. 855,372. Renewed May 3, 192e. serial no. 558,311.

To all whom 'it may concern:

Be it known that I, JOHN HAYs HAM- MoNn, Jr., a citizen of the United States, and a resident of Gloucester, county of Essex, and State of Massachusetts, have invented an Improvement in Systems for Control of Moving Bodies by Radiant Energy, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to system for controlling and operating /moving bodies 0r mechanisms at a distance, and more particularly to systems in which pneumatic, hydraulic or other fluid pressure or vacuum controlled mechanism for operating the steering gear, engine or other functioning or controlling device or mechanism of moving bodies, is controlled by radiant energy from a distant station.

Within the scope and purpose of the invention, the moving 'body may be of any suitable type, such, foi-example, as a vessel, vehicle or air-craft. I have chosen for illustration the application of my invention to the steering of a torpedo or like vessel.

In the accompanying drawings wherein is disclosed a single embodiment ot' my invention;

Fig. 1 is a view mainly diagrammatic and partially 1n section, of a system constructed in accordance with and embodying 'one type of my invention, the gyroscope being represented as functioning in the control vot" the vessel;

Fig. 2 is a view mainly in longitudinal section, of one type of means for modifying the action 'of the gyroscope or other controller upon the moving body;

Fig. 3 is a view mainlydlagrammatic ofl one type of means responsive to radiant energy for operating the valve means controlling the flow of motive fluid;

cal section, of said valve means when the' Figs. 4 and 5 are views mainly invertivessel is being controlled from a distance; Figs. 6 to 11 inclusive are 'cross sections upon the corresponding lines of Fig. 3;

Fig. 12 isav detail in vertical section of one form of means for effecting the functioning of the gyroscope; and

Fig. 13 is a detail representing one form of means for adjusting certain of the contacts.

My invention particularly relates (to the control of vessels from a distance by radiant energy, preferably in theV form of electromagnetic waves, although other types of moving bodies vmay be so controlled and within the scopey of the invention other forms of radiant energy may be employed, such, for example, as light or sound waves. In accordance with the disclosed embodiment of the invention, Il provide means whereby the steering apparatus can be controlled or governed at a distance by radiant energy andv whereby the vessel may be kept upon a predetermined course at other times by a gyroscope or other suitable controller or azimuth-maintaining means located upon the vessel. During the periods when the vessel is not under the control of an operator at the distant control station, it is maintained upon its course by a suitable controller or azimuth-maintaining means which is herein typified as a gyroscope. Said controller, which I will hereinafter refer to as a gyroscope, may be permitted to function in any suitable manner in maintaining the vessel upon its course, but preferably I employ fluid under pressure, such, for example,

as compressed air, and through the agency of said gyroscope I permit compressed air to be admitted into -a main or steering cylinder at either side of the piston therein, so as to turn the rudder to starboard or port,

as may be required to maintain the vessel l rudderv is thereupon thrown through a wide angle in the opposite direction, thus moving the vessel out of its course in the opposite direction. c The result is that the vessel tends to move in a sinuous path, the general direction or axis of which is or may be the predetermined direction.

In that embodiment of my invention shown in my said co-pending application, I

have represented a system in which the control of the steering means Ais largely obtained through the instrumentality of fiuid under-pressure. In this application I have represented a simpler system wherein the control of the steering mechanism is largely effected through electrical connectionsv by which the operation of fiui'd under pressure is controlled or governed.

I have, therefore, in accordance with the present invention, provided a simpler sys-` tem including means to modify, limit or restrict the angle through which the rudder is moved upon each functioning of the gyroscope, thus 'fiattening or largely reducing the sinuosity of the path of the vessel and maintaining it much more nearly in its predetermined course.

Referring more particularly to the vdrawings wherem I have represented merely one embodiment of means for carrying out my invention, I have therein represented the main or steering cylinder at 1, it being provided with a piston 2 carried by a piston rod 3 extending entirely therethrough. The piston rod 3 vis surrounded by coil springs 4 upon opposite sides of the piston 2, thereby tending to restore the piston to centra] position within the cylinder. The piston rod 3 is represented as suitably connected to a cross-head 5 which, in turn, is pivotally connected through a suitable link 6 with a lever 7 coaxially with which is mounted the rudder or steering device 8, here diagrammatically indicated. l

I have diagrammatically indicated a gyroscope or other suitable controller or governing device at 9, it being equipped with means whereby when the vessel deviates from its course in either direction, motive uid is admitted into the cylinder 1 upon the proper side of the piston 2. 1

The motive fluid preferably employed is air under pressure. I have herein represent ed a suitable reservoir l0' from which air under pressure is conveyed through a passage 11, by means of valve devices to be hereinafter described, into opposite ends of the cylinder 1. For this purposen I have provided passages 12 and 13, leading to and communicating with opposite ends of the lsteering cylinder 1, the passage of motive fluid through said passages being controlled by suitable valve means which may beand preferably are similar to those shown in my said co-p'ending application.-

Preferably between the main or steering cylinder I and the reservoir 10, I interpose two functioningdevices through the action of one of which kI either permit the gyroscope to function in the control of the vessel, or permit the operator at the distant control station to steer the vessel; and through the other of which I modify ythe helm angle or angle through which the rudder moves when Vvopposite the terminal 21.

- dered inactive and the rudder is moved through a wider and preferably through a full angle, through the means responsive to the distant control station.

The-first of these functioning devices is indicated, in this embodiment of my invention, at 14, it preferably being a rotary valve 'of the general type and construction disclosed in my said co-pending application.

The second of said functioning devices and` which is'controlled or governed electrically, is herein indicated generally at 15, it being preferably a suitable valve mechanism for modifying. limiting or restricting the angleI through whichthe rudder is moved when the course of the vessel is controlled bythe gyroscope, and being preferably of the general construction shown in said co-pending application. Before describing said func- Preferably the construction of tioning devices in detail, I will set forth the operation of the system as a whole. Within the casing 16 of the valve mechanism 15, is mounted a plunger or piston 1'7 vextending through the opposite ends thereof and constituting also the core or plunger of 'two solenoids 18, 19. From the solenoid 18 leads a conductor 20 having a terminal 21 in proximity to the arm 22 of the gyroscope 9. From the solenoid 19 leads a conductor 23 provided with a terminal 24 also in proximity to said arm 22, but at the side thereof Upon apparent movement of the gyroscope arm 22 in either i direction, that is, upon deviation of theves` sel from its predetermined course, contact is made by the arm 22 with either the terminal 21 or the terminal 24 thereby to effect energization of the corresponding solenoid 18 or 19.

Also leading from the solenoids 18 and 19 are. conductors 25, 26,*which are in circuit as shown, with a battery '27 or other suitable source of motive power. Leading from the battery 27 is a con-ductor 28 having two .terminals 29 `,and 30, the former extending from the cross-head 5.,.and the latter being stationarily mounted preferably in proximity thereto. The terminal 29 is indicated asa suitable wire but the terminal 30 is preferably a bar or other suitable Amember of -considerable extent in a direction longitudinally of the cylinder v1 so that Contact may be made with said terminal 30-throughout a considerable portion of the movement of the piston 2 in said cylinder 1. i

Extending from the gyroscope 9 is a conductor 30 which extends to and is supported marea near one end upon the cross-head 5. The said conductor is there provided with a suitable terminal which is adapted to make contact with the elongated terminal A 30 and to slide therealong lin the movements pff the cross-head 5 to the right V,or to the Also leading from the solenoid18 is a conductor 31 extending into suitable proximity to the movable terminal 29 and provided with a suitable terminal 32 at one side of and in the path of movement of, said terminal 29. Extending from the solenoid 19 is al conductor 33 extending into suitable proximity to said movable terminal 29 and there provided with a suitable terminal 34 also in the path of movement of the terminal 29 but at' the side thereof opposite the terminal 32.

Upon movement of the piston rod 3 to the right or left, viewing Fig. 1, the terminal 29` will make contact with the terminal 32 or the terminal 34 and thereby effect energization of the solenoid 18 or the solenoid 19. The contact of the terminals '30, 30 effects energization of the solenoid 18 when the arm 22 of the gyroscope 9 makes contact with the terminal 21 and when the piston 2 is between the center of the cylinder 1 and thev left hand end thereof, and the contact of the terminals 29 and 34 effects energization of the solenoid 19 when the arm 22 of the gyroscope 9 makes contact with the terminal 24, when the piston 2 is between the center of the cylinder and the right hand end thereof. As set forth more fully hereinafter, this causes fluctuating movements of the rudder, the lpiston 2 being then at the right-hand portion of the cylinder 1. When, however, the piston 2 is nearer the left-hand end of the cylinder 1, then the contact of the ,termlnals 30, 30 effects energization of n the `solenoid. 19 by reason of the contact of the-gyroscope arm 22 with the terminal 24. Such energization continues untilthe contact is broken at the left-hand end of the terminal 30 whereupon the terminals 29, 32, contact ,and the solenoid 18 is energized. Thus fluctuating movements of the rudder are caused with the piston 2 in the left-hand end portion of the cylinder 1.

Preferably I provide suitable means, as hereinafter set forth, whereby the length of the terminal 30 may be varied and whereby` the distance between the terminals 32 and 34 may correspondingly be varied. VPreferably the construction is such that a change in the length of the terminal 30 automatically and correspondingly increases or decreases the distance between the terminals 32 and 34.

Any suitable means or construction may be provided to effect the breaking of con-- tact at the terminals 29, 30, 30, 32 and 34. For. example, 'I may employ at each contact, a relay which is energized and (le-energized iii;

in suitable manner to draw an armature away from each terminal. Any other suitable de- Vof the cylinder 1, is in communication with the rotary vvalve casing 14 at 41 and the passage 12,which is in communication with the right-hand end of said cylinder 1, is in communication at 42 with said rotary valve casing 14.

The construction of parts 1s such that air or other motive fluid under pressure is admitted through the passage 35 into the valve mechanism 15 and passing therethrough is admitted', by either the passage 37 or the passagev 38 to the rotary valve casing 14.

Depending upon the position of the rotar valve 43, that is, depending upon its posltion as shown, or its position at 180 therefrom, neither of which is a neutral position, the motive fluid is admitted through either the passage 12 or the pasage 13, to the cylinder 1, thereby tomove the piston 2 to they right or to the left and* thus to turn the. rudder 8 in a-corresponding direction.

Assumingthat the rotary valve 43 has .been so positioned through the receipt of impulses from the distant control station that the gyroscope 9 is permitted tofunction in the control of the vessel, and assuming that the vessel departs from itsv course thereby effecting contact between the arm 22 and the terminal 21, the solenoid 18 is energized so as to move the core or plunger 17 to the left, viewing Fig. 1, and to admit motive fluid through the passages 35, 37, into the rotary valve 43. The position of said valve 43 is such that said motive fluid is admitted intol the passage 13 and is thereby conducted into the left-hand end of the cylinder '1, moving the piston 2 and piston-rod 3 toward the right, viewing said figure. Said movement of the piston and piston rod continues until the terminal 30 is moved beyond the right-hand end of the terminal 30 .whereupon the contact is broken and the solenoid 18 is de-energized, whereupon the core or plunger 17 is returned to its former position and the supply of air through the passages 3'5, 37 and 13 is shut off. At the same time contact is made by the terminal 29 with the terminal 34, vthereby effecting energization of the solenoid 19` and thus effecting movement to the right of the core or plunger 17 Aand the admission of motive flu1d to the; right-hand end of the cylinder 1 end of the cylinder 1 may ensue very' rapidly -after admission of motive .fluid to the lefthand end of said cylinder and I thereby effect the stopping of the motion of the piston 2 and piston rod 3 toward the right and their. return movement to the left until the contact is broken at the terminals 29, 34, and is restored at the terminals 30, If, at this time, the arm 22 of the` gyroscope 9 is still in contact with the terminal 21, the described operation is repeated, the motive fluid being admitted first into one end of the cylinder 1 and then into the oppositeend thereof until the boat is back upon its true course, whereupon the arm 22 of the gyroscope 9 breaks contact with the terminal 21.

If the vessel departs'from its course in the opposite direction and the arm 22 of the gyroscope 9 makes contact with the terminal 24, then the solenoid 19 .is energized and the core or plunger 17 is moved to the right, viewing Fig. 1, thereby admitting motive fluid through the passages 35, 3.8 and 12 into the right-hand end'of t e Cylinder 1, thus `moving the Vpiston 2 a'n piston rod 3 to the left, This motion continues so long as the terminal 30 makes contact with the terminal 30, but when the terminal 30j moves beyond the terminal 30, then contact is instantly made. between the terminals 29 and 32 and 'thereupon the solenoid 18 isenergized and the core or plunger 17 is moved to the left, thereby instantly admitting motive fluid through the passages 35,37 and 13 to the left-hand end of the cylinder 1, thus instantly checking the movement of the piston 2 and piston rod 3 toward the left and causing their return toward the right. If the arm 22 of the gyroscope 9 is still in Contact with the terminal 24, this operation continues, the piston rod 3 and piston 2 being moved back and forth until the vessel is again upon its true course.

The terminals 32, 34 are preferably at a distance .apart corresponding to the length of the terminal 30 so that immediately upon breakage of contact between the terminals 30, 30, contact 'is made by the terminal 29 with either the terminal 32 or 34. The result is that at whichever end of the cylinder motive fluid under`pressureis admitted to effect movement of the piston 2, motive fluid is promptly admitted at the oppositeV end of the cylinder so as to check the movement of the piston in the determined direc- 'tion and to limit, modify or restrict the anf'gle' through' which the rudder may turn. The rudder'when underthe' control of the gyroscope, may be permitted to move through any suitable angle. Preferably, however, the construction 1s such that it is limited^to a movement of from 2 to 10l degrees, depending 'upon the .distance between theterminals 32, 34, and the length of the i terminal 30. In the manner? describedv or in any other suitable manner, the amount 4fof -the positioning of which is determined by the operator atthe distant control station. In such figures, the valve casing .is represented at 14, it having positioned therein a suitable valve 43 having a' spindle 44 extending through the casing. Upon sai-d spindle is loosely mounted a gear 45 and fast thereon is a ratchet 46 with which engages a pawl 47 upon the the gear 45 and held in position by a' spring'48. In this or in any other suitable manner the valve 43 is rotated step by step. y

I impart a step -by-step movement to said valve 43 by means responsive to the distant controlstation. For-this purpose I have `represented n Fig. 3Y an open oscillatory circuit'49 this being connected to the winding 50 of closed oscillatory circuit of any suitable type and here shown as having therein a condenser; 51, stopping condenser .52 and a suitable detector.,53 for electrical oscillations. At 54 I have represented a sensitive relay or other contact making device.- These parts may be of any suitable construction not herein necessary morel fully to describe or to indicate, At 55 I have represented a circuit controlled by the relay 54 having therein a battery 56, and at 57 I have indicated a solenoid, the core or plunger 58 of which is provided with teeth 59 with which mesh the teeth of the gear 45 whereby, upon energization of the solenoid 57, the rotary valve 43 is moved onel step and as herein indicated, through 90 degrees.

The rotary valve 43, as shown most clearly in Figs. 1, 4 and-5, is provided at preferably diametrically opposite points with grooves 60, 61, adapted as shown in Fig.' 1, to be placed respectivelyv in connection with the passages 37 39, 41, and 40, 42, thereby as indicated in said figure, permitting the iiow of fluid through the passages 37 13, into the lleft-hand end of the cylinder 1,' or permitting the flow Vof fluid .through thepassages 38, 12, into the right-hand end of said cylinder. Between the grooves 60, 61, the said valve 43 is provided with a groove 62 shown in two opposite positions in Figs, 4 and 5.

Between its en'ds the said groove 62 passes from the surfaces of Athe 'valve into the innerportion thereof as represented at'63 in said figures. At its vinner end the said groove 62 is adapted to be placed in communication with either the passagev 13 or 'the passage 12, depending upon the 'posif tion of said valve and as represented in Figs. 4 and 5.. The opposite or outer end of said groove62 is in communication with 4a circumferential groove 66 communicating Vwith ,the exhaust 67. Thesaid valve 43 is also provided with a longitudinal groove 68 which is in communicationwith a circumferential groove 69, t-he latter as represented in Figs. 1, 4 and 5, being in communication with the passage 70 leading from the main fluid supply reservoir 10. Also extending from the circumferential groove 69 is a longitudinal groove 71 which,.as shown in Fig. 5, is adapted to be placed in communication with a passage'72 leading to an axial passage 7 3y in the ,upper portion 74 of the'gyroscope rodyrepresented as mounted in the case 7 5. Between the longitudinal grooves 68 and 71 ofthe rotary valve 43, are two longitudinal. grooves 7 6, 77, both communi- .cating at their out-er ends with a circumferential groove k7 8, itself in communication with the exhaust 79.

Thevgyroscope rod is herein represented as formed of two parts adapted to be suitably clutched .together as represented in Fig. 12. The upperpart 74 is enlarged to provide achamber 80 having a piston 81, the piston 'rod 82 wherein is surrounded by a coil spring 83 and extends into a hollow head or casing 84 on the lower part 85 of the gyroscope rod and is there provided with a clutching disk 86. The construction is 'such that when air or other motive fluidurider pressure is admitted into the passages 72, 73, the piston 81 is forced'` downwardly and the clutch disk 86 is ,forced out of clutching engagement with the surface of the hollow head. or casing84. When, however, air for'other motive fluid is permitted to exhaust from the passages 72, 73, then the "coil spring 83 lifts the plunger 82 and forces the disk 86 into clutching engagement with the inner surface of the hollow head 8 4 the gyroscope rod 85 and also moves the Said head into clutching engagement with the under-surface 87 of the casing or chamber 80, thereby permitting the gyroscope to function in its control of the vessel. If desired,l the clutching surfaces may be roughened or otherwise'lsuitably shaped to insure a clutching engagement of Athe parts..

The rotary valve 43 herein shown is typical merely of a valv'e that may be employed for the purpose stated.

In Figs. 1 and 2 I have represented one form of means for modifying` limitingJ or restricting the angle through which ther/rudder is moved when thecourse ofthe vessel is controlled by the gyroscope. For this purpose I have, in this embodiment of the invention, provided the valve mechanism 15, herein shown as lconsisting of a cylinder Vhaving 'moungted therein the solenoid core or plunger 17. The latter, as shown Vmost clearly in Fig. 2, is provided with a piston 88 fastl thereon and adapted, when moved to the, right or tothe left, to admit motive fluid through the passage 35 into the pas.-

pressed solenoids 18' and 19 are deenergized the piston 88 assumes the central position shown in Fig. 2, and exhaust of the motive fluid is permitted through each nd of the casing or cylinder.

Assuming that the gyroscope is functioning in the control of the vessel, 'and that thearm 22 thereof makes contact with the terminal 21, the solenoid 18 will be` l energized under the conditions hereinbefore set forth and the core or plunger 17 will be moved ltoward the left, viewing Figs. y1 and 2, thereby permitting commotive fluid to pass through the passage `35 and thence through the 'passage 37 to 'the rotary valve 43, along the groove 60 thereof, and thence along the passage 13 into the left-hand end of the main or steering cylinder 1, as 'represented in Fig. 1. This, as previously stated, will cause the piston 2 in s aid main or steering cylinder to move toward the right, and hence will turn the rudder 8 to port or tothe left, viewing the sheet.

If now the compressed air thus admitted to the cylinder 1 were permittedto move the piston through its full stroke, that is to act without restraint, it would move -the rudder 8 through a wide angle which,

in practice, may approximate y45C. This is open to the objections before pointed out, and in Order to prevent such action I have provided modifying, limiting or anglerestricting means, Aone type of which is herein illustrated. The action thereof is such that the movement of the piston rod 3 toward theJ right, viewing Fig. 1, will effect deenergization of the solenoid 18 and energizationof the solenoid 19, thereby effecting movement of the core or plunger 17 to the right, viewing Figs. 1 and 2. Such movement of the core or plunger 17 at once cuts off the compressed motive fluid that was admitted through the passage 35 to the passage 37. The samel movement of the or reduced.

cylinder 1 is permitted to exhaust there from through the passage 13, the passage 60, the passage 37, and the grooved portion 92 of the solenoid 17.

Thereupon the piston 2 -and the plston rodA 3 again move toward the left, thus deenergizing the solenoid 19. Such return movementof the piston and piston rod is,

however, checked or modified in the manner` already described, so that the angle through which the rudder 8 is permitted to move while the gyroscope is functioning, is re# duced to the desired extent. y

When motive fluid is admitted into thc right-hand end of the main or steering cylinder l it is immediately, or substantially immediately, admitted into the left-hand Aend thereof and is permitted to exhaust from the right-handl end thereof through the passages heretofore referred to. rl `hus, in any 'case motive fluid, when admltted to one end of the main or steering cylin-I der, is thereafter promptly admitted at the other end thereof and is exhausted from the end first referred to. The result is that slight vor fluctuating movements ofthe rudder are obtained and the sinuosity. of the courseof the vessel is very much flattened If the arm 22 of the gyroscope makes contact with 'the terminal 24, the'solenoid 19 is energized and, in a manner similar to that described, the motive fluid is admitted tothe right-hand end of the main or steering cylinder and exhausted from the left-hand end thereof, thereby moving the rudder 8 to starboard. Such movementis, however, modified and limited through the action of the described means, as aligeady fully set forth.

. It will be evident from the foregoing dcscription that there will or may be a succession of slight movements or fluctuations of the piston rod 3, first in one direction and then in the other, in one end 'or the other of the steering cylinder 1, when contact is made by the gyroscope arm 22 with the terminal 2l or the'terminal 24.

When the gyroscope is functioning as described, in the control of the vessel, the

air or other motive Huid under pressure is` the gyroscope 9, a suitable impulse is sent and the valve 43, which during the control of the vessel by` the gyroscope has. occupled the positionshown in Fig. l (or a'posit1on at 180 therefrom) is turned through 90o to the position shown in Fig. 4, 012110,

that shown in Fig. 5. Assuming that the valve ,is turned into the position shown in Fig. 4, it will be observed that the helm or rudder-anglesmodifying means shown in Fig. 2 is temporarily rendered inactive, inasmuch as the longitudinal passages-60, 61 of the rotary valve 43 no longer place the passages 39 and 13, and 38 and 12, respectively, in communication. During the control of the vessel from the distantl control station, motive fluid is permitted to exhaust through both ends of the valve mechanism 15, as indicated in Fig. 2.

When the rotary valve 43 is in the osition shown in Fig. 4, the motive fluid 'is admitted under pressure directly from the main reservoir 10 through the passage 70, and hence through the cylindrical groove 69 and the longitudinal groove v68, where it is admitted to the passage 72, and hencel unclutches the gyroscope and temporarily terminates the functioning thereof. At the same time the mot-ive Huid is admitted from the passage 68 to the assage 12, and hence to the right-hand endp of the main or steering 90v cylinder 1, so that the rudder .8 is moved through a Wide ,angle to starboard. At the same time the motive Huid is exhausted from the left-hand end of said steering cylinder throughV the passage 13, which, as shown in Fig. 4, is in communication through thev irregularlyshaped passage 62, 63 with the exhaust 67. If, however, the rotary valve 43 be positioned as shown in Fig. 5, then motive fluid under pressure is admitted from 100 the reservoir 10 through the passage 70 and thence through the passage 68 and the passage 13 into the left-hand end of the main o-r steering cylinder 1. At the same time it is exhausted fromthe right-hand endthereof 105 Vthrough the passage 12 and through the irregularlyshaped passage 62, 63 to the exhaust passage 67, whereby 'the rudder isA moved through a Wide angle to port.

Upon the termination of steering from 110 the distant control station, the rotary valve 43 is turned through anotherstep, and as hereindisclosed through an angle o-f 90 degrees and the rudder angle-limiting means is again made active, but as the rudder has been moving through the full helm angle during the control of the 4vessel from the .distant control station,'the piston rod 3 is or may be at one extreme or lthe other of its movement. If the position of the piston 120 rod 3 is such that Vthe cross-head 5 occupies its extreme4 position tothe left, contact will be made by the terminal with the terminal 32, thereby energizing the solenoid 18, which will thereupon admit motive/fluid through the valve mechanism 15 and the passages 37 and 13 to the Lleft-hand end of the steering cylinder y1, thereby moving the piston rod 3 to the right until contact is broken at the terminals 29, 32, and contact ismade at 130 the terminals 30, 30. The gyroscope thereupon assumes control of the vessel as here.

tofore described.

If, upon the termination of t-he control of the vessel` from shore, the cross-head 5 is at the opposite extreme of its movement, a

Asimilar action takes place and the piston through which the rudder is permitted to,

move during its control by the gyroscope, While for this purpose I may employ any suitable means, I preferably provide means for moving the contacts 32 and 34 toward and from each other and for correspondingly shortening or lengthening the contact 30. Any suitable means may be provided for this purpose. In Fig. 13 I have represented the contacts 32 and 34 as respectively carried by insulating posts orl members 93, 94, which also carry extensible portions 95, 96, of the Vcontact 30, and with which latter sliding Contact is adapted to be made. Said posts or members 93, 94 are mounted upon right and left threaded nuts 97, 98, through which passes an adjusting screw`99.I The body portion of the contact 30 is mounted at 100 upon an unthreaded portion of the adjusting screw 99. By rotation of the adjusting screw 99 in the proper direction the contacts 32, 34 are moved toward each other and the contact 30, with its extensions 95, 96, is correspondingly shortened. Rotative movement 4ofthe adjustin screw in the opposite direction effects furt er separation of the contacts 3'2, 34 and elongation of the contact 30. In this or any other suitable manner the degree of movement'of the rudder 8 may be varied.

From the foregoing description it will be understood that the course of t-he vessel or other body controlled by radiant energy may be governed by a suitable controller, and

that by said controller such body or vessel,

may be maintained in a path approximating and approaching, if desired, closely to an exact course.

Having thus -described one illustrative embodiment of my invention, I desire it to be understood that although specific terms are employed they are used in a generic andv -descriptive sense and not for purpose of limitation, the scope of the invention being set forth in the following claims:

1. A system for the-control of' moving bodies at a distance by radiant energy including,` in combination, a body to be propelled, steering means thereon, means ac-A come the effect of said modifying means and to 'steer said body selectively through any part of an unlimited angle with respect to said direction.

2. A system for the control =of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, means active upon said steering means to maintain a predetermined or definite direction of bodily movement of said body, make-and-break contact devices to modify the action of said direction-maintaining means upon said steering means, and means operative to overcome the effect of said modifying means and to steer said bod selectively through any part of an unlimited angle with respect to said direction.

3. A system for' the control of moving bodies at a distance by radiant energy in. cluding', in combination, a body to be propelled, steering means thereon, means -active upon said steering means to maintain a predetermined or definitedirection of bodily movement of said body, and electrical connections operated by movement of the steering means to modify the actionof said direction-maintaining means upon said steering means.

4. A system for the control of moving bodies ata' distance by radiant energy including, in combination, a-body to be propelled, steering means thereon, means active upon said steering means to maintain a predetermined or definite direction of bodily movement of said body, and. electricallycontrolled means to reduce the angular movement of.v said steering means below that whichl would be imposed by the normal action of said direction-maintaining means.

5. A system for the control of moving bodies at a distance-by radiant energy including, in combination, a body to be propelled, steering means thereon, means active upon said steering means to maintain a predetermined or definite directionl of bodily movement of said body, and make-and-break contact devices to reduce the angular movef ment of said steering means below that which would be imposed by the normal action of said direction-maintaining means.

6. A-system for the control of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, means active upon said steering means to maintain a predetermined or definite direction of bodily movement of said body, and electricalv connections operated by the movement of the steering means to reduce the angular movement of said steering means below that which would be imposed by the normal action of said direction-maintaining means.`

7. A -system for the control of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, means act1ve upon said steering means to maintain a predetermined or definite direction of bodily movement of said body, electrical connections operated by movement of the steering means to modify the action of said direction-maintaining means upon said steeringV means, and means lresponsive to radiant energy from a distance to control the action of said modifying means. 9. A system for the control of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, means active f, upon said steering means to maintain a predetermined or definite directionf of` bodily movement of said` body, electrically controlled meansl to. reduce the angle of movement of said steering means below. that which Would be imposed-by the normal act1on of said direction-maintaining means,

and means responsive to radiant energy.

from a distance to control the action of said to controlvtheaction angle-reducing means. y

10. A system for the control of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means-thereon, means ac tive uponsaid steering means to maintain a predetermined or definite direction of bodily `movement of said body, electrical connections operated by movement of the steering means-to reduce the angle /of movement-ofsaid steering means below that which would .be imposed by the .normal action of said dlrection-rnaintaimug);means, and means re-l sponslve to radiant energy from a distance I ofsaid angle-reducing means.1

11. A system for the control of moving bodies 'at a distance by radiant energy including,in combination, 'a body to be propelled, steering means thereon, means active upon said steering means to maintain`a predetermined. ordefinite direction of bodily movement of `said body, `fluid pressure means tomdify the' action of said direction-maintaining means upon the steering,

means,. and. electrically controlled means governing the actionof said `fluid pressureactuated-modifying means.

12. A system for` the control Aof moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, means active upon said steering means to maintain a predetermined or denite direction of bodily movement of said body, fluid pressure means to modify the action of said directionmaintaining means upon the steering means, and 'electricalconnections operated by movement of the steering means to modify the action of said direction-maintaining means upon said 'steering means.

14C. A system for the control of ,moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, means active uponsai'd steering means to maintain a predetermined or definite .direction of bodily movement of said body, fluid pressure means to modify the action of said direction-maintainingmeans upon the steering` means, lelectrically-controlled means :governing the 4action of said fluid pressure-actuated-modifying means, and means responsive to -radiant energy from a distance to control the action of said fluid pressure-actuatedmodifying means. v

15. A system for the control of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, means active upon said steering means to maintain a predeterminedA or definite direction of bodily movement of said body, fluid pressure means to modify the action of said direction-maintaining means upon the steering means, make-and-break contact' devices to modify the action of said direction-maintaining means upon said steering means, and means responsive to -radiant energy from a distance to control the action of said fluid pressure-actuated-modifying means.

16. A system for the ycontrol of moving bodies at a distance by radiant energy .in-

cluding, in combination, a body to be pro.

pelled, steering means thereon, means actlve Aupon 'saidsteering means tol maintain a pre-- determined or definite direction of bodily movement ofsaid body, fluid pressure means to modify the action of said direction-maintaining means upon the steering means, electrical connections operated by movement of the steering means to modify' the action of lftlsfzeaL said direction-maintaining means upon said steering means, and means responsive to radiant energy from a distance to control the action of said fluid-pressure-actuatedmodifying means.

17. A system for the control of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, means active upon .said steering means to maintain a predetermined or definite direction of bodily movement of said body, fluid pressure means to modify the action of said direction-maintaining means upon the steering means, make-and-break contact devices controlled by the action of the steering means to modify the action of said direction-maintaining means upon the steering means, and solenoids adapted to be energized by said contact devices to operate said fluid pressureactuated-modifying means.

18. A system for the control of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, means active upon said steering means to maintain a predetermined or definite direction of bodily movement of said body, fluid pressure means to modify the action of said direction-maintaining means upon the steering means, make-and-break contact devices controlled by the action of the steeringameans to modify the action of said direction-maintaining means upon the steering means, and solenoids adapted to be energized by said con-4 tact devices to operate said fluid pressureactuated-modifying means, the latter having a plunger constituting a core for said solenoids.

19. A system for the control of moving bodies at a distance by radiant energy in cluding, in combination, a body to be propelled, steering means thereon, means active upon said steering means to maintain a predetermined or definite direction of bodilyY movement of said body, fluid pressure means to modify the action of said direction-maintaining means upon the steering means, make-and-break contact devices controlled by the action of the steering means to modify the action of said direction-maintainin means upon the steering means, and solenolds adapted to be energized by said contact devices to operate said fluid pressureactuated-modifying means, the latter comprising a valve casing, and a plunger therein constituting a core for said solenoids. I

20. A system for controlling the operation of moving bodies at a distance by radiant energy-including, in combination, a body to be propelled, steering means thereon, a gyrolscope, fluid pressure means' controlled by said gyroscope to govern the action of said steering means, and electrically controlled means operated bythe movement'of said steering means to modify the action of said gyroscope upon the steering means.

21. A system for controlling the operation of moving bodies at' a distance by radiant energy includ/ing, in combination, a body to be propelled, steering means thereon, a gyroscope, fluid pressure means controlled by said gyroscope to govern the action of said steering means, and make-and-break contact devices operated by the movement of said steering means to modify the action of said direction-maintaining means upon said steering means.

22. A system for/controlling the operation of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, a gyroscope, fluid pressure .means controlledsaid gyroscope to govern the action of said steering means and electrical connections operated by movement of the steering means to modify the action of said direction-maintaining means upon said Steerin means.

23. A system for controlling t e operation of .moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, a gyroscope, fluid pressure means controlled by said gyroscope to govern the action of said steering means, make-and-break contact devices controlled by the movement of the steering means to modify the action of said direction-maintaining means upon the steering means, and solenoids adapted to be e11- ergized by said contact devices to operate said fluidl pressure-actuated-modifying means.

2 4. A system 4for controlling the operation ofmoving bodies at a distance by radiant energy including, in combination, a'body to be propelled, steering means thereon, a gyroscope, fluid pressure means controlled by said gyroscope to govern the action of said steering means, make-and-break contact devices controlled by the movement of the steering means to modify the action of said direction-maintaining means upon the steering means, and solenoids adapted to be `energized by said contact devices to operate said fluid pressure-actuated-modifying means, 'the latter having a lunger constituting a core for said solenoi s.

25. A system for controlling the operation. of moving bodies at a distanceby .radiant energy including, in combination, a body to. be propelled, steering means thereon, a gyroscope, fluid pressure means controlled by steering means, electrically controlled means controlled by said steeringmeans to modify the action of said gyroscope uponthe steering means, and means responsive to radiant energy from a distance to control the action of said modifying means.

26. A system for controlling the operation of moving bodies at .a distance by radiant said gyroscope to govern the action of said l scope, fluid pressure meanscontrolled byl energy including, in combination, a body to be propelled, steering means thereon, a gyroscope, fluid pressure means controlled by said gyroscope to govern the action of said steering means, make-and-break contact devices controlled Aby said steering means to modify the action of said direction-maintaining means upon said steering means, and means responsive to radiant energy from a distance to control the action of said modifying means.

27. A system for controlling the operation of moving bodies at a distance by radiant energy including, in' combination, a body to be propelled, steering means thereon, a gyroscope, fluid pressure means controlled by` said gyroscope to govern the action of said steering means, electrical connections operated by movement of the steering means to modify the action of said direction-maintaining means upon said steering means, and means responsive to radiant energy from a .distance to control the action of said modifying means.

28. system for controlling the operation of moving bodies at a' distance byradiant energy including, incombination, a body Ato be propelled, steering means thereon, a gyroscope, fluid pressure means controlled by said gyroscope to govern the ac-l tion of said steering means, fluid pressure means to modify the action of said gyroscope upon said steering means, and elec-v trically controlled means governing the action of said fluid pressurecontrolled-modifying means.

-29. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, a gyroscope, fluid pressure means controlled by said gyroscope to govern the action of said steering means, Huid pressure means to modify the action lof 'said gyroscope upon said steering means, and make-and-break contact devices to modify theaction of said direction-maintaining means upon steering means.

30. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination, a body toV be propelled, steering means thereon, a gyrosaid gyroscope to govern the action of said steering means, fluid pressure means to modify the action of said gyroscope upon said steering means, and electrical connections operated by movement of the steering means to modify the action of said direction-maintaining means vupon said steering means.

31. A system 'for controlling the operation of moving bodies'at a distance by radiant lenergy including, in combination, a body to ,be propelled, steering means thereon, a gyroscope, fluid pressure means controlled by Said said gyroscope to govern the action of said 32. A system for controlling the operation I of moving bodies at a distance by radiant energy Including, 1n comblnatlon, a body to be propelled, steering means thereon, a

gyroscope, fluid pressure means controlled.V by said gyroscope to govern the action of said steering means', Vvalve means to modifythe action of said gyroscope upon said steering means, and make-and-break contact devices to modify the action of said direction-maintaining means upon said steering means.

33. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon a gyroscope, fluid pressure means controlled by said gyroscope to govern the'action ofsaid steering means, valve means to modify the action of said gyroscope upon said steering means, and electric connections operated by movement of the steering means to modify the 'action of said direction-maintaining means Vupon said steering means.

34. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, a gyroscope, fluid pressure means controlled by said gyroscope to govern the action of said steering means, helm angle-reducing means between the gyroscope and the steering means, and electrically controlled means governing. the action of said helm anglereducing'means.

35. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination, a body to lsteering 'means, helm angle-reducing means between the gyroscope and the steering means, and make-and-break contact devices to modify the action of said helm anglereducing means.

. 36; A system for controlling the operation of moving bodies at a distanceY by radiant energy including, in combination, a body to be propelled, steering means thereon, a gyroscope, fluid pressure means controlled by said' gyroscope to govern the action of said steering 'means, helm angle-reducing means between the gyroscope and the steering means, and electrical connections operated by movement of the steering means to modify the action of said helm angle-reducing means,

37. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, a gyroscope,iiuid pressure means controlled by said gyroscope to govern the action of said steering means, helm angle-reducing means between the gyroscope and the steering means, electrically-controlled means governing the action of said helm angle-reducing means, and means responsive to radiant energy from a distance to control the action of said helm angle-reducing means.

38. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, a gyroscope, fluid pressure means controlled by said gyroscope to govern the action of said steering means, helm angle-reducing means between the gyroscope and the steering means, make-and-break contact devices to modify the action of said helm angle-reducing means, and means responsive to radiant energy from a distance to control the action of said helm angle-reducing means.

39. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, a gyroscope, fluid pressure means controlled b y said gyroscope to govern the action of said steerlng means, helm angle-reducing means between the gyroscope and the steering means, electrical connections operated by movement of the steering means to modify the action of said helm angle-reducing means, and. means responsive to radiant energy from a distance to control theA action of said helm angle-reducing means.

40. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering meansithereon, fluid pressure means, means active upon said fluid pressure means to maintain a predetermined or definite direction of 'bodily movement of said body, and electrically controlled means to effect the steering of said body selectively through any part of an unlimited arc.

41. AA system lfor the control of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon, fluid pressure Lmeans to control said steering means, a gyroscope governing the action of said fluid pressure means, electrically-controlled means to modify the normal action of said gyroscope upon said steering means, and step-by-step means responsive to radiant energy from a distance to control the action of said modifying means.

42. A system for the control of moving 1oodies at a -distance by radiant energy in- 'lll cluding, in combination, a body to be propelled, steering means thereon, fluid pressure means to control said steering means, a. gyroscope governing the action y of said fluid pressure means, electrically-controlled means to modify the normal action of said gyroscope upon said steering means, and a rotary valve having actuating means responsive to radiant energy from a distance to control the action of' said modifying means.

43. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon and including a Huid pressure receiving chamber having a piston, means for admitting and for exhausting motive fluid from each side of the piston in said chamber, a gyroscope controlling such -admission and exhaust, and electrically-controlled means including a stationary electrical contact and a movable electrical contact cooperating therewith and actuated by said steering means to modify thei action of said gyroscope in its control of said admission and exhaust.

44. A system for controlling the operation of moving bodies at a distance byradiant energy including, in combination, a body to be propelled, steering means thereon and including a fluid pressure receiving chamber having a piston, means for admitting and for exhausting motive fluid to and from each side-of the piston in said chamber, a gyroscope controlling such admission and eX- haust, and electrically-controlled means to effect fluctuating action of said piston and thereby to limit the helm angle.

45. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination, abod to be propelled, steering means thereonan including a fluid pressure receiving chamber havingl a piston, means for admitting and for exhausting motive fluid to and from each side of the piston in said chamber, a gyroscope controlling such admission and exhaust, and make-and-break contact devices to effect fluctuating action of said piston an thereby to limit the helm angle.

,46. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon and including a fluid 'pressure receiving .chamber having a piston, means for admitting and for exhausting motive fluid to and from each side of the piston insaid chamber, a gyroscope controlling such admission and exhaust, and electrical connections operated by movement of the steering means thereby to effect fluctuating action of said piston, and thereby to limitV the helm angle.

47. A system for controlling the operation of moving bodies at a distance by radiant energy including, in-combination, a body to be Ipropelled, steering means thereon and including a fluid pressure receiving` chamber having a piston, means for admitting and for exhausting motive fluid to and from each side of the piston in said chamber, a gyroscope controlling such admission and exhaust, electrically-controlled means to effect fluctuating'action of said lpiston and thereby, to limit the helm angle, and means responsive to radiant energy to control the action of said means for effecting fluctuating action of the piston.

48. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon and including a fluid pressure receiving chamber having a piston, means'for admitting and for exhausting motive fluid to and from each side of the piston in said chamber, a gyroscope controlling such admission and exhaust, make-and-break contact devices to effect fluctuating action of said piston and thereby to limit the helm angle, and means responsive to radiant energy to control the action of said means for effecting luctuating'action of the piston.

49. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination,. a

- body to be propelled, steering means there-- on and including a fluid -pressure receiving chamber having a piston, means for admitting and for exhausting motive fluid to and from each sidel of the piston in said chamber, a gyroscope controlling such admission and exhaust, electrical connections operated by movement of the steering means thereby to effect fluctuating action of said piston, and thereby to limit the helm angle, and means responsive to radiant energy to control the action of said means for effecting fluctuating action of the piston.

50. A system for controlling the operation of moving bodies at a distance by radiantenergy including, in combination, a

body to be propelled, steering means there-A on a-nd including .a fluid pressure ,receiving chamber having-a piston, means for admitting and for exhausting motive flu-id"to and froml each side of the piston in said chamber,

a gyroscope controllin such admission and exhaust, and electri'cal yoperated means under the control of radiant energy from a distance toimpose fluctuating movement upon 5l. A system for controlling thoperation of moving bodies at a distance by radiant energy including, in combination, 'a body to bepropelled', steering means thereon including a fluid pressure lreceiving chamber having a-piston, means for admitting and for exhausting motive fluid to and from each side of the piston'in said chamber, a

gyroscope controlling such admission and exhaust, electrically-operated means to impose fluctuating movements upon said piston While the body is controlled by the gyroscope, and means responsive to radiant energy from a distance to terminate the function of said gyroscope. l

' 52. A system for controlling the( operation of moving bodies at a Adistance by radiant energy including, in combination, a body to be propelled, steering means thereon and including a fluid pressurereceiving chamber having a piston and having fluid connections to opposite sides thereof, direction-maintaining means controlling the admission of motive fluid to each side' of saidl chamber, and electrically controlled means to admit motive fluid to that side of the chamber oppositethat to which motive fluid is .admitted by the controlling action of said' direction-maintaining means.

53, A system for controlling the opera. tion of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon and including a fluid pressure receiving chamber having a piston and having fluid connections to opposite sides thereof, a gyroscope controlling the admission of motive fluid to each side ofsaid chamber, and electrically-operated means controlled by the movement of said piston toadmit motive fluid tothe sidevof said piston opposite that at Which it lis admitted by the controlling action of said gyroscope.

54. A system for controlling the operation of moving bodies at a distance by radiant energy including, in combination, a body to be propelled, steering means thereon and including a fluid pressure receiving 105 chamber having a piston and having fluid connections to opposite sides thereof, a gyroscope controlling the admission of motive fluid to each side of said chamber, and makeand-break contact devices controlled by the 110 movement of said piston to admit motive fluid to the 'side of said piston opposite that at. which it is admitted-by the vcontrolling action of said gyroscope.

55. A system for controlling the opera- 115 t1on of moving bodies at a distance by radiant energy including, in combination, a body to-be propelled, steering means thereon and including a fluid pressure receiving chamberhaving a piston and having fluid 120.

connections to opposite sides thereof, a gyroscope controlling the admission of motive piston thereby to limit the helm angle. 130

56. The combination with a movable body, of means carried thereb and automatically operative to stabilize sald body with respect to a given axis, and electrically controlled means operative to limit the automatic actionof said stabilizing means.

57. The combination with a movable body, of automatic means carried thereby to stabilize said body with respect to a given axis, electrically controlled means operative to restrict the effective action of said automatic means on said body, and means responsive to energy transmitted from a distant point to modify the automatic control of said body by said stabilizing means and said lrestricting means, and to rotate said 'body selectively about said axis either in one direction or in an opposite direction.

58. The combination with a movable body, of automatic mea-ns carried thereby to stabilize said body with respect to a given axis, electrically controlled means operative to restrict the effective action of said automatic means on said body, and means responsive to energy transmitted from a distant point to modify the automatic control of said body by said stabilizing means and said .restricting means, and to rotate said body selectively about said axis through any part of an unlimited angle.

59. The combination With a movable body, of automatic means carried thereby to stabilize said body With respect to a given axis, electrically controlled means operative to restrict the effective action of said automatic means on said body, and means responsive to energy transmitted from a distant point to terminate the automatic control of said body by said stabilizing means and said restricting means, and to rotate said body selectively either in one direction or in an opposite direction.

60. The combination with a movable body, of automatic means including a gyroscope carried thereby to stabilize said body With respect to a given axis, means controlled by electricity and operative to restrict the effective action of said gyroscope on said body, and means responsive to radiant energy transmitted from a distant point to modify the control of said body by said stabilizing means and said restricting means, and to ro- 1 tate said body about vsaid axis 'selectivelyv be propelled, steering means thereon and includingl a fluid pressure receiving chamber having a piston and having fluid connections to opposite sides thereof, a gyroscope controlling the admission of motive fiuid to each sidefof said chamber, and means controlled by movement of said pistou to admitmotive fluid to the side of said piston opposite that, at which it is admitted by the controlling action of said'gy'roscope.

63. A system for controlling the operation of moving bodiesat a distance by radiant energy including, in combination, a body to be propelled, steering means thereon and including a fiuid pressure receiving chamber having a piston and having fluidvconnections to opposite sides thereof, a gyroscope controlling'the admission. of motive fluid to each side of said cha1nber,.andl means operated by vmovement of said piston quickly to admit motive fluid to said chamber at the side thereof-opposite to that at which motive fluidA is admitted by the controlling action of said gyroscope, thereby to limit the helm angle. y

ln testimony whereof, I have signed my of two subscribing Witnesses.

JOHNJHAYS HAMMOND, JR.

Witnesses:

JOHN P. KOEHLER, F. J. BEER.

`energy including, in combination, a body to ,name to this specification, inthe presence 

